Tabletop Gaming

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I recently tested all of my D20's for fairness, this was the worst offender after 100 rolls (files.catbox.moe)

submitted 7 months ago by [email protected] to c/[email protected]

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[–] Tramort 6 points 7 months ago (1 children)

This assumed you only tested one die.

If OP tested a thousand dice, and this is the one that came out on the bottom, then it's incredibly likely it's just random because of how many dice were tested.

MULTIPLE COMPARISON CHANGES THE RULES OF STATISTICAL HYPOTHESIS TESTING, and the OP is giving us a single result from multiple comparisons which are censored.

Probably an innocent mistake, but not valid.

[–] [email protected] 1 points 7 months ago

With one die we can calculate the probability of getting that result and compare it to a distribution of fair dice, that gives us a probability of 0.24% that the average of 100 rolls of a 20 sided fair die is 8.88 or lower.

Knowing op rolled 17 dice (17 sets of 100) we can calculate the probability of that even happening with fair dice to be around 4% meaning very likely that die is unfair.

At least this is how i think this goes